. a) Describe the molecular organization of cell membrane.  

The cell membrane, also known as the plasma membrane, is a selectively permeable barrier that separates the internal environment of the cell from the external environment. It is composed of a lipid bilayer with embedded proteins, carbohydrates, and other molecules that play important roles in cell function.

The lipid bilayer is the basic structure of the cell membrane and consists of two layers of phospholipid molecules arranged with their hydrophobic tails facing each other and their hydrophilic heads facing outwards. The hydrophobic tails of the phospholipids are composed of fatty acid chains, while the hydrophilic heads are ______ _____ ______ _______ ____.
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